All of them have 2 motors, there is no RC car which has only 1 motor, all of them have at least 2 motors, one for forward and reverse (the one that drives the hind wheels) and one for steering (the one that causes the front wheels to turn left and right).

Just one note for the RC people who have not found a good supplier for parts yet. Try hobbyking.com . They have great prices and really interesting parts. They do take a while to make it to the USA, coming from China, but you can't beat the prices, even on EBay, most of the time.

AWESOME job. You are right, most of the cheap RC Cars (especially the ones from Walmart) use one motor for forward/backward motion and one for Steering. In the 'Hobby Level' cars, steering is done with a servo. I've been going the 'other way' with the cheap car... that is, tearing out the guts and putting in new electronics and servo (receiver, Speed Controller and batts). However, I've kept the controller and recievers from them, and was thinking of different applications to use them for. Your Idea is GREAT. Think I'm gonna have to try it!